Input
     Input contains an integer N in the first line, and then N lines follow. Each line consists of a pair of integers a and b, separated by a space, one pair of integers per line. 


Output
      For each pair of input integers a and b you should output the sum of a and b in one line, and with one line of output for each line in input.
Sample input:
     2 
     1 5 
     10 20 


Sample output:
     6

     30

#include<iostream>
#include<stdio.h>

using namespace std;

int main(void)
{
	int n,x,y;
	scanf("%d",&n);
	while(n--)
	{
		if(scanf("%d%d",&x,&y)!=EOF)
			printf("%d\n",x+y);
	}
	return 0;
}

如果輸入的終止條件不是n，而是輸入了0 0，那麼程式碼就變成了下面這樣：

#include<iostream>
#include<stdio.h>

using namespace std;

int main(void)
{
	int x,y;
	while(scanf("%d%d",&x,&y) &&(x!=0 || y!=0))
	{
		printf("%d\n",x+y);
	}
	return 0;
}